This reminds me of Steve Martin discussing the horrors of cat juggling in The Jerk. Apparently someone found cats walking on keyboards a big enough problem to create a program that could detect "Cat-like typing". When the program detects a cat walking across the keyboard it locks the keyboard functions and makes an annoying noise over the computer speakers to scare the cat away. There's even a helpful Q&A on the site, addressing questions like "What if my cat is deaf?" with part of the answer being "PawSense detects the paws of even deaf cats." That's brilliant.